Graphics card problem

Welcome to HWF :)

Make sure you have the latest graphics drivers installed from nvidia.com.

Overheating could also be a cause. Open the case of the computer, and look for dust. especially in the fan of the graphics card. If you find loads of dust, you can clean it with a can of compressed air.
 
i ran two cards like this and had some over heating problems but it could be possible ur not up to date with all ur drivers or psu might not "not likely" be pushing enough power to the cards
 
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